Updated EFAPI definition for x64 GCC. Original thinking was to add optional EFIAPI support to standard GCC. New thinking is to support EFIAPI as a seperate processor target. This is to reduce validation risk to the main line GCC. Update the definition and comments to match current thinking. 

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@1883 6f19259b-4bc3-4df7-8a09-765794883524
1 file changed